Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jrasc..78..155h&link_type=abstract
Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 78, Aug. 1984, p. 155-162.
Astronomy and Astrophysics
Astronomy
6
Extragalactic Radio Sources, Radio Sources (Astronomy), Astronomical Maps, Centimeter Waves, Comets, H Ii Regions
Scientific paper
Observations of a 2-deg-sq field centered on the optical H II region S121, obtained in a 20-MHz band centered at 1.424 GHz with the synthesis telescope of the Dominion Radio Astrophysical Observatory (comprising four 9-m antennas on a 600-m east-west line and having a 1.6 x 0.8-arcmin synthesized beam at position angle 148 deg) during March 1983, are reported. Maps and a grey-scale representation reveal an unusual source about 0.5 deg NE of S121. The source consists of a diffuse 2.5-arcmin-diameter head which is identified as the object (BG 2107+49) detected at 408 MHz by Fanti et al. (1974) and a spiral-curve tail with length 50 arcmin and maximum width 15 arcmin; the integrated flux densities of the head and tail are measured as 1.95 and 4.8 Jy, respectively. Although it cannot be ascertained whether the observed cometary structure is a single extragalactic source or simply a superposition of unrelated Galactic objects, the latter explanation is seen as more probable.
Higgs Lloyd A.
Vallee Jacques P.
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